1、 AEROSPACE MATERIAL SPECIFICATION RINGS, SEALING, SILICONE RUBBER High Temperature Resistant, Low Compression Set 65 - 75 SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely
2、voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites yo
3、ur written comments and suggestions. Copyright 2007 SAE International All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written
4、 permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA) Fax: 724-776-0790 Email: custsvcsae.org SAE WEB ADDRESS: http:/www.sae.org AMS 7264A Issued OCT 1982 Revised APR 1988 Reaffirmed JUN 2007 Superseding AMS 7264 RATIONALE This docum
5、ent has been reaffirmed to comply with the SAE 5-year Review policy. THIS REVISION CONTAINS ONLY EDITORIAL CHANGES 1. SCOPE: 1.1 Form: This specification covers a silicone rubber in the form of molded rings. 1.2 Application: Sealing rings for use from -55 to +205 C (-65 to +400 F) in dynamic applica
6、tions and from -60 to +260 C (-80 to +500 F) in static applications. 2. APPLICABLE DOCUMENTS: The following publications form a part of this specification to the extent specified herein. The latest issue of Aerospace Material Specifications, Aerospace Standards, and Aerospace Information Reports sha
7、ll apply. The applicable issue of other documents shall be as specified in AMS 2350. 2.1 SAE Publications: Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096. AMS 7264A SAE AMS 7264A - 2 - 2.1.1 Aerospace Material Specifications: AMS 2350 Standards and Test Methods AMS 2817 Packaging a
8、nd Identification, Preformed Packings 2.1.2 Aerospace Standards: AS 568 Aerospace Size Standard for O-Rings AS 871 Manufacturing and Inspection Standards for Preformed Packings (O-Rings) 2.1.3 Aerospace Information Reports: AIR 851 O-Ring Tension Testing Calculations 2.2 ASTM Publications: Available
9、 from American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103. ASTM D1414 Testing Rubber O-Rings 3. TECHNICAL REQUIREMENTS: 3.1 Material: Shall be a compound, based on a silicone elastomer, suitably cured to produce sealing rings meeting the requirements of 3.2. 3.2 Prop
10、erties: Rings shall conform to the following requirements; tests shall be performed on the rings supplied in accordance with ASTM D1414, insofar as practicable. Tensile strength testing is not required on rings which are too small to permit assembly on rollers and are, after cutting, too short to pe
11、rmit testing as a single strand. Eliminating testing for tensile strength does not eliminate testing for elongation; elongation test can be made by stretching a ring over a mandrel of a size which will stretch the ring sufficiently to produce the required elongation when figured on the ID of the rin
12、g. Calculations of tensile strength and elongation may be made in accordance with AIR 851. AMS 7264A SAE AMS 7264A - 3 - 3.2.1 As Received: 3.2.1.1 Hardness, Durometer “A“ or equiv. 70 5 3.2.1.2 Tensile Strength, minimum 750 psi (5.15 MPa)3.2.1.3 Elongation, minimum 110% 3.2.1.4 Corrosion Nil 3.2.1.
13、5 Specific Gravity Preproduction Value 0.02 3.2.2 Dry Heat Resistance: Temperature: 260C 3 (500F 5)3.2.2.1 Tensile Strength Change, -20% Time: 168 hr 1.0 maximum 3.2.2.2 Elongation Change, maximum -40% 3.2.2.3 Hardness Change, Durometer “A“ or equiv. 0 to +10 3.2.3 Compression Set: Temperature: 260C
14、 3 Percent of Original Deflection, (500F 5) maximum 50 Time: 22 hr 0.25 3.2.4 Low-Temperature Resistance: Temperature Retraction TR10point, maximum -55C (-65F) 3.3 Quality: Rings, as received by purchaser, shall be uniform in quality and condition, smooth, as free from foreign material as commercial
15、ly practicable, and free from internal imperfections detrimental to their performance. Surface imperfections shall be no greater than permitted by AS 871 for minor defects. 3.4 Sizes and Tolerances: Shall be as specified on the drawing. Inspection for conformance to dimensional requirements shall be
16、 made in accordance with AS 871. AMS 7264A SAE AMS 7264A - 4 - 4. QUALITY ASSURANCE PROVISIONS: 4.1 Responsibility for Inspection: The vendor of rings shall supply all samples for vendors tests and shall be responsible for performing all required tests. Results of such tests shall be reported to the
17、 purchaser as required by 4.5. Purchaser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the rings conform to the requirements of this specification. 4.2 Classification of Tests: 4.2.1 Acceptance Tests: Tests to determine conformance to the follow
18、ing requirements are classified as acceptance tests and shall be performed on each lot: Requirements Paragraph Reference Hardness, as received Tensile Strength, as received Elongation, as received Specific Gravity, as received Compression Set 3.2.1.1 3.2.1.2 3.2.1.3 3.2.1.5 3.2.3 4.2.2 Periodic Test
19、s: Tests to determine conformance to the following requirements are classified as periodic tests and shall be performed at a frequency selected by the vendor but not exceeding six months unless frequency of testing is specified by purchaser: Requirement Paragraph ReferenceCorrosion, as received 3.2.
20、1.4 Tensile Strength Change after dry heat exposure 3.2.2.1 Elongation Change after dry heat exposure 3.2.2.2 Hardness Change after dry heat exposure 3.2.2.3 Temperature Retraction, TR10point 3.2.4 4.2.3 Preproduction Tests: Tests to determine conformance to all technical requirements of this specif
21、ication are classified as preproduction tests and shall be performed prior to or on the first-article shipment of rings to a purchaser, when a change in material, processing, or both requires reapproval as in 4.4.2, and when purchaser deems confirmatory testing to be required. AMS 7264A SAE AMS 7264
22、A - 5 - procuring activity, contracting officer, or request for procurement. 4.3 Sampling: Shall be as follows: 4.3.1 For Acceptance Tests: Sufficient rings shall be taken at random from each lot to perform all required tests; the number of determinations for each requirement shall be as specified i
23、n the applicable test procedure or, if not specified therein, not less than three. 4.3.1.1 A lot shall be all rings of the same size from the same batch of compound processed in one continuous run and presented for vendors inspection at one time but shall not exceed 1000 rings or 100 lb (45 kg), whi
24、chever is the lesser mass. A lot may be packaged in smaller quantities and delivered under the basic lot approval provided lot identification is maintained. 4.3.1.2 A batch shall be the quantity of compound run through a mill or mixer at one time. 4.3.1.3 When a statistical sampling plan and accepta
25、nce quality level (AQL) have been agreed upon by purchaser and vendor, sampling shall be in accordance with such plan in lieu of sampling as in 4.3.1 and the report of 4.5.1 shall state that such plan was used. 4.3.2 For Periodic Tests: As in 4.3.1 for the batch from which the samples are taken. 4.3
26、.3 For Preproduction Tests: As agreed upon by purchaser and vendor. 4.4 Approval: 4.4.1 Sample rings shall be approved by purchaser before rings for production use are supplied, unless such approval be waived by purchaser. Results of tests on production rings shall be essentially equivalent to those
27、 on the approved sample. 4.4.2 Vendor shall use ingredients, manufacturing procedures, processes, and methods of inspection on production rings which are essentially the same as those used on the approved sample rings. If necessary to make any change in ingredients, in type of equipment for processi
28、ng, or in manufacturing procedures, vendor shall submit for reapproval a statement of the proposed changes in material, processing, or both and, when requested, sample rings. Production rings made by the revised procedure shall not be shipped prior to receipt of reapproval. 4.2.3.1 For direct U.S. M
29、ilitary procurement, substantiating test data and, when requested, preproduction test material shall be submitted to the cognizant agency as directed by the AMS 7264A SAE AMS 7264A - 6 - 4.5 Reports: The vendor of rings shall furnish with each shipment a report showing the results of tests to determ
30、ine conformance to the acceptance test requirements and stating that the rings conform to the other technical requirements of this specification. This report shall include the purchase order number, AMS 7264A, vendors compound number, lot number, part number, and quantity. 4.5.1 In addition to the r
31、eports of 4.5.1, the vendor shall furnish at six-month intervals the results of tests to determine conformance to the periodic test requirements. This report shall be included with, or shall form a part of, the report of results of acceptance tests on the first lot of rings shipped following determi
32、nation of conformance to the periodic test requirements. 4.6 Resampling and Retesting: If any specimen used in the above tests fails to meet the specified requirements, disposition of the rings may be based on the results of testing three additional specimens for each original nonconforming specimen
33、. Failure of any retest specimen to meet the specified requirements shall be cause for rejection of the rings represented and no additional testing shall be permitted. Results of all tests shall be reported. 5. PREPARATION FUR DELIVERY: 5.1 Packaging and Identification: Shall be in accordance with A
34、 M S 2817. 6. ACKNOWLEDGMENT: A vendor shall mention this specification number and its revision letter in all quotations and when acknowledging purchase orders. 7. REJECTIONS: Rings not conforming to this specification or to modifications authorized by purchaser will be subject to rejection. 8. NOTE
35、S: 8.1 Marginal Indicia: This revision contains only editorial changes from the previous issue of this specification and, therefore, no phi () symbols indicating technical changes are required, AMS 7264A SAE AMS 7264A - 7 - 8.2 Dimensions and properties in inch/pound units and the Celsius temperatur
36、es are primary; dimensions and properties in SI units and the Fahrenheit temperatures are shown as the approximate equivalents of the primary units and are presented only for information. 8.3 For direct U.S. Military procurement, purchase documents should specify not less than the following: Title,
37、number, and date of this specification Size or part number of rings desired Quantity of rings desired Applicable level of packaging (See AMS 2817). 8.4 Rings meeting the requirements of this specification have been classified under Federal Supply Classification (FSC) 5330. THIS SPECIFICATION IS UNDER THE JURISDICTION OF AMS COMMITTEE “CE“.
